isooctane
noun
iso·oc·tane ˌī-sō-ˈäk-ˌtān 
: an octane of branched-chain structure or a mixture of such octanes
especially : a flammable liquid octane used in determining the octane number of fuels
Word History
Etymology
International Scientific Vocabulary
First Known Use
1909, in the meaning defined above
- harlequin beetle
- harlequin bug
- harlequin cabbage bug
- harlequin duck
- harlequin ladybird
- harlequin opal
- harlequin pigeon
- harlequin quail
- harlequin snake
- harlequin table
- harlequinade
- harlequinades
- harlequined
- harlequining
- harlequinism
- harlequinned
- harlequinning
- harlequins
- Harley
- harling
- Harlingen
- harlot
- harlotries
- harlotry
- harlots